Flex :: How To Use A String As An E4x Expression
Oct 2, 2009
Possible Duplicate:In Flash, how would I run an e4x statement when that statement is stored in a String?I know there is an existing question regarding this problem, but it got no replies.Ideally, I would like to stick an e4x expression in a string and run it.
var tempXML:XML = someXML;
var stringe4x:XML = "pictures.picture.(size > 200)";
tempXML.eval(pictures); //something instead of eval
Since AS3 doesn't have eval, this doesn't work; however, there is the ability to use elements() and attributes() to get the elements or attributes on the same XML node level, but this doesn't work for the more complicated e4x filters such as "(id > 300)" or ".." notation.
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Feb 4, 2011
I need to evaluate an expression in a string at run time . Not sure how to achieve this in Flex. My requirement is as follows
var test:String = "myparams.id=10" ;
//test will be a string populated at runtime.
// I need to treat it as an expression and evaluate it at runtime
[Code]....
is it possible to do something like this action script 3?
I believe the eval function earlier allowed this, but now it has been depreciated?
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Mar 16, 2009
I need to convert a string such as "x*y+2" (from an input text field) into an expression x*y+2, so that it can be evaluated normally, eg f=x*y+2. The variables x and y are already defined and can have various values; I need to evaluate the strings as expressions.
I have tried f=Number("x*y+2") but it seems to work only when the string is actually a number such as "1.2e-4".
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Jul 11, 2011
I have a string "5^2". Is there a way to calculate the value of the expression stored in the string?
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Jan 10, 2011
I'm trying to find the number of newlines in a string using the Actionscript 3.0 RegExp engine. Using the string.match function and RegExp(" ","g") does not find the newlines in a string which contains newlines. Is there something I need to add to the pattern or something else that I am missing?
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Nov 15, 2007
I have the following function:
Code:
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{
[code].....
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Aug 29, 2009
I am using RegExp to search for character sequences within strings. I was wondering if/what is the proper way to use a string stored in a variable as a regular expression. For example: [code]I'll have to use another string manipulation tool to search for the sequence.
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Aug 14, 2010
I want the user to input a regular expression, which is then used.
I'm using following at the moment.
PHP Code:
var filterEx = new RegExp(filterTxt.text.split("/")[1], filterTxt.text.split("/")[2]);
filterTxt is a textbox, when traceing the pattern is seemingly correct, but i.e.:
[Code]...
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May 31, 2011
give me the Regular Expression that can check if a given string has any HTML code in it, and coming to think of it I would be bothered with <a href="something">something</a> exactly.
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Nov 27, 2010
Does anyone know the regular expression to test if a single string character has both upper and lower case character?
eg. All A-Z and a-z.
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Mar 11, 2010
I've written a url validator for a project I am working on. For my requirements it works great, except when the last part for the url goes longer than 22 characters it breaks. My expression:/((https?)://)([^s.]+.)+([^s.]+)(:d+/S+)/i
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[Code]...
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Mar 14, 2010
I'm having a problem with an expression in my sql statement in SQLite for Adobe AIR basically I have this sql = "UPDATE uniforms SET status=@status WHERE customerId IN(19,20)"; updateStmt.parameters["@status"] = args[1]; updateStmt.execute();
if I run the above code it works, updating the status when the id are 19 and 20
but if I pass the ids list as a parameter like this
sql = "UPDATE uniforms SET status=@status WHERE customerId IN(@ids)";
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Nov 5, 2010
I'm having a problem converting a regular expression from Python into Flex. My string is something like this:
SELECT "col", othercol,
othercol3" FROM doesn'tmatter...
Python matches just fine:
>>> re.search('select(.*?)from', 'SELECT "col", othercol,
[Code]..
match always ends up null. What am I doing wrong? I'm sure it's obvious to a seasoned Flex programmer...
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Feb 25, 2011
Is it possible to create wrong Regular expression in ActionScript/Flex which will cause runtime error? I've tried so many weird regexpes in Flex and Flex never complained! How do I know If my regexp valid?
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Mar 10, 2011
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[Code]...
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Aug 10, 2011
I need a regular expression pattern for validating the following path directory:
[Code]...
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Sep 21, 2011
I have a String variable in my flex (flash builder 4) application containing CSV data. I need to allow the user to download this data to a local file. For example, giving them a "csv" button to click and it might present them with a save file dialog (and I would be sending the contents of my string variable).Is this possible / how ?I am using the ResuableFX component for the datagrid to csv. This the code I ended up with that works to save the string to a text file for the user (in a web browser):
var dg2CSV:DataGrid2CSV = new DataGrid2CSV();
dg2CSV.includeHeader=true;
dg2CSV.target=adgEncounters;
[code]......
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Apr 13, 2004
I embed a text file into my Flex project and read its contents using code like this:
[Embed(source = "../../data/abc.txt", mimeType = "application/octet-stream")]
private var r_Abc:Class;
var xx:ByteArray = new r_Abc();
[code].....
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Mar 14, 2012
I need to extract the name of the video from the below xml. find the e4x expression for this?
[Code]...
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Apr 9, 2011
I'm new to these forums and to actionscript as well, so please excuse my lack of clarity when explaining this situation, I'm learning on my own and in my free time!This isn't really a problem in the sense that I've found a workaround to it, but it's bugging me that I don't understand what's going on in this situation. In the last couple of weeks I have been working on a gridless pathfinding solution for a point & click game, I finally got it done, but I was stuck at some point for a few days and I discovered that there was an x property of a point I was referencing that kept changing back to a previous value assigned to it. I don't know if I'm making any sense, but so you guys see what I'm talking about:
[Code]...
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Feb 3, 2004
First a fabric button sets:
_root.fabricbuttonselected="_root.fabric01";
then the color button sets:
_root.selectedcolor=_root.fabricbuttonselected + "_chip10_name";
This returns the name of a variable:
"_root.fabric01_chip10_name"
however I have preset the variable to "Rose"
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My dynamic text box is set to:
_root.selectedcolor
but instead of displaying "Rose" it displays"_root.fabric01_chip10_name" Basically I need to get the literal value to equal an expression- how do I do this?
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May 30, 2004
Is it possible to delete an IF expression? Like when you delete an onEnterFrame ?
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Mar 22, 2009
I am scripting a button and something like this: _root.READ = ("image6"); takes me exactly where I want, the frame labeled "image6" However i want to reuse this button and I want to switch it to something like: _root.READ = (trace(this._name)); where it calls upon the instance name (image6). However, this doesn't work, and I believe it's because there are no quotes around the word. Is there someway I can output what the trace calls and put it in quotes?
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Sep 7, 2011
So why can I evaluate an expression in a switch like so:
[Code]...
If I trace vidList[currentIndex].video before the switch I get "city" but tracing vid after the switch I get null Quickly solved by just assigning to a variable and then using that in the switch... but it still seems odd I can't just do it directly.
[Code]...
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Feb 10, 2009
I'm creating a chat app and I would like to if someone enters a url that it turn color and turn into a hyperlink. I am not sure how to write the regular expression. I guess the approach would be to check for "http://" or "www." or ".com" ?
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Jul 9, 2009
I'm trying to create a replace method that allows me to surround parts of a string with tags. I tried this with a regular replace technique (join and split) but thats case sensitive. what i want is:
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and replace "Ice" in that line to surround it with bold tags, result:
text: "A n<b>ice</b> example line"
ActionScript Code:
var str:String = "A nice example line";
var pattern:RegExp = /(w+)-(w+)/gi;
trace(str.replace(pattern, "$2,$1"));
But i just can't figure out the replace pattern
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Sep 18, 2009
I'm a complete novice to ActionScript, OOP and Flash. I have no idea when you are supposed to use the keyword "this". I have searched the forums but obviously searching for the word "this" is not very successful! I've read quite a few tutorials now and it seems that different people have different opinions on when and where it should be used. For example what should I be doing in the following class? Both seem to work but is one the "correct" way? Are there situations where things will not work if you omit the "this"?
ActionScript Code:
public class Sector {
private var _radius:Number;
public function Sector(radius:Number){
[B]this.[/B]_radius = radius;
} public function get radius():Number{
return this._radius;
} public function set radius(value:Number):void{
this._radius = value;
}}
I have another possibly related question with regards to naming conventions. I like the use of underscores for properties with getters and setters but what about the names of the constructor parameters that are used to initialise these properties? In the above example I have used "radius" for the constructor parameter although it is also used for the getter and setter functions. It seems a bit of a palaver to come up with different names for the same quantity but is what I have done really bad coding practice?
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Sep 22, 2011
I have 3 extenal flv files that can be loaded into the main movie when pressing a button.I am using seek and cuePoints to provide a DVD 'chapter-type' navigation.The cue points (in seconds) for each flv are stored as separate arrayshen I click to load a flv, I want to change the array that is being used to seek the playhead.I thought I could do that by using a 'current movie' variable and use an expression to access the relevant array. The essential code (for brevity) is like this:
//
var flv1cuePoint:Array = new Array(10,30,50);
var flv2cuePoint:Array = new Array(30,50,60);
[code].......
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May 30, 2004
Is it posible to delete an IF expression? Like when you delete an onEnterFrame ?
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Apr 8, 2006
Code:
var Happy:Array
Happy[Happy.length] = "_root.Train1_mc"
[code].....
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